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Justifying adding batteries ????????
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<blockquote data-quote="johnb2713" data-source="post: 549917" data-attributes="member: 35153"><p>I did a very simple calculation for my DIY battery and only considered charging from the grid, it does of course charge from solar too but thats a bonus. </p><p>Octopus Intelligent tariff gives me 7.5p off peak and 29.2p peak. I have 14 kWh of usable battery storage in my DIY unit. </p><p>Savings per kWh = 29.2 - 7.5 = 21.7p kWh</p><p>Per charge 21.7 x 14 = £3.03</p><p>Battery and inverter cost = £4200 / £3.03 = 1386 days or 3.8 years.</p><p></p><p>There are some small losses in conversion AC to DC and DC to AC and there are also gains in Solar PV charging. There is a massive earning potential during the grid balancing sessions that are done during winter. My actual payback using the realtime data is just over 2.4 years.</p></blockquote><p></p>
[QUOTE="johnb2713, post: 549917, member: 35153"] I did a very simple calculation for my DIY battery and only considered charging from the grid, it does of course charge from solar too but thats a bonus. Octopus Intelligent tariff gives me 7.5p off peak and 29.2p peak. I have 14 kWh of usable battery storage in my DIY unit. Savings per kWh = 29.2 - 7.5 = 21.7p kWh Per charge 21.7 x 14 = £3.03 Battery and inverter cost = £4200 / £3.03 = 1386 days or 3.8 years. There are some small losses in conversion AC to DC and DC to AC and there are also gains in Solar PV charging. There is a massive earning potential during the grid balancing sessions that are done during winter. My actual payback using the realtime data is just over 2.4 years. [/QUOTE]
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Justifying adding batteries ????????
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